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Change EDNS_EXPIRE field to support zero length option data (Resolves #…
…1292) As per [RFC7134](https://datatracker.ietf.org/doc/html/rfc7314#section-2) the Expire Option in queries should be zero-length. In the current implementation the field is uint32 which always instatiates 4bytes for that field when packing to wire format. For that reason we change the field to []uint8 so it can support 0-length and 4-byte length option data.
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